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Journal of Experimental Biology, Vol 201, Issue 3 375-384, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Decay of Ca2+ and force transients in fast- and slow-twitch skeletal muscles from the rat, mouse and Etruscan shrew

P Wetzel and G Gros
Zentrum Physiologie, Medizinische Hochschule Hannover, Germany.

Isometric single-twitch force and intracellular Ca2+ transients were recorded simultaneously, using fura-2, from slow- and fast-twitch muscle fibres of the rat, mouse and Etruscan shrew Suncus etruscus. In the slow-twitch rat soleus, force half-relaxation time was three times longer than the 50% decay time of the fura-2 signal. In contrast, in the fast-twitch extensor digitorum longus muscles of all three animals, muscle relaxation preceded Ca2+ decay. It is proposed that this surprising property of fast-twitch muscles is due to their pCa-tension curve, which is shifted to the right compared with that of slow-twitch muscle.
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© The Company of Biologists Ltd 1998